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* `actions::split` and `actions::split_when` now support partial application and
  pipelining ([\#1085](https://github.com/ericniebler/range-v3/issues/1085)).
* `views::group_by` and its iterator both get a `.base()` member to access the
  underlying range and iterator, respectively.
* Improved diagnostics with clang.
* Assorted bug fixes and compiler work-arounds:
  [\#284](https://github.com/ericniebler/range-v3/issues/284),
  [\#491](https://github.com/ericniebler/range-v3/issues/491),
  [\#499](https://github.com/ericniebler/range-v3/issues/499),
  [\#871](https://github.com/ericniebler/range-v3/issues/871),
  [\#1022](https://github.com/ericniebler/range-v3/issues/1022),
  [\#1043](https://github.com/ericniebler/range-v3/issues/1043),
  [\#1081](https://github.com/ericniebler/range-v3/issues/1081),
  [\#1085](https://github.com/ericniebler/range-v3/issues/1085),
  [\#1101](https://github.com/ericniebler/range-v3/issues/1101),
  [\#1116](https://github.com/ericniebler/range-v3/issues/1116),
  [\#1296](https://github.com/ericniebler/range-v3/issues/1296),
  [\#1305](https://github.com/ericniebler/range-v3/issues/1305), and
  [\#1335](https://github.com/ericniebler/range-v3/issues/1335).

Many thanks to GitHub users @CaseyCarter, @morinmorin, @h-2, @MichaelWJung,
@johelegp, @marehr, @alkino, @xuning97, @BRevzin, and @mpusz for their
contributions.

\section v0-9-1 Version 0.9.1

_Released:_ Sept 1, 2019.

gcc-9.x portability fixes.

\section v0-9-0 Version 0.9.0 "Std::ranger Things"

_Released:_ Aug 26, 2019.

Bring many interfaces into sync with the C++20 draft.

* **NEW:** An improved concepts portability layer with macros that use C++20
  concepts when the compiler supports them.
* **NEW:** An improved directory structure that keeps disjoint parts of the
  library -- iterators, ranges, algorithms, actions, views, functional
  programming support, and general utilities -- physically separate.
* **NEW:** A `RANGES_DEEP_STL_INTEGRATION` configuration option that makes your
  STL implementation default to structural conformance to infer iterator
  category, as in C++20. Applies to libc++, libstdc++, and MSVC's Standard
  Library.
* **NEW:** A `ranges::cpp20` namespace that contains all the functionality of
  C++20's `std::ranges` namespace.
* All concept names have been given standard_case (renamed from PascalCase) and
  have been harmonized with the C++20 draft.
* The following range access customization points no longer accept rvalue ranges
  by default:
  - `ranges::begin`
  - `ranges::end`
  - `ranges::rbegin`
  - `ranges::rend`
  - `ranges::cbegin`
  - `ranges::cend`
  - `ranges::crbegin`
  - `ranges::crend`
  - `ranges::data`
  - `ranges::cdata`
* Iterators may specify an `iterator_concept` type alias in addition to
  `iterator_category` -- either as a nested type or as a member of a
  `std::iterator_traits` specialization -- to denote conformance to the C++20
  iterator concepts as distinct from the C++98 iterator requirements.
  (See [P1037 "Deep Integration of the Ranges TS"](http://wg21.link/p1037)
  for more information.)
* The `ranges::value_type` trait has been renamed to `readable_traits`.
* The `ranges::difference_type` trait has been renamed to `incrementable_traits`.
* The `ranges::iterator_category` trait has been deprecated. Specialize
  `std::iterator_traits` to non-intrusively specify an iterator's category
  and (optionally) concept.
* Rename the `ranges::view` namespace to `ranges::views` and `ranges::action` to
  `ranges::actions` (with deprecated namespace aliases for migration).
* Rename `view::bounded` to `views::common`.
* Rename `unreachable` to `unreachable_sentinel_t`.
* Change `dangling` from a class template that wraps an iterator to a class that
  acts as a placeholder for an iterator that would otherwise dangle.
* Implement C++20's `subrange` as a view that wraps an iterator/sentinel pair;
  deprecate `iterator_range`.
* Deprecate implicit conversion from view types to containers; rename
  `ranges::to_` to `ranges::to` and extend it to support converting a
  range-of-ranges to a container-of-containers.
* Deprecate the `ranges::v3` inline versioning namespace.
* The following views have had minor changes to bring them into conformance with
  the C++20 working draft:
  - `join_view`
  - `single_view`
  - `empty_view`
  - `split_view`
  - `reverse_view`
  - `all_view`
  - `take_view`
  - `iota_view`
  <p/>`iota_view<std::[u]intmax_t>`, in particular, is given a user-defined
  `difference_type` that avoids integer overflow.
* New names for the iterator and range type aliases:
  | Old Name                      | New Name                    |
  |-------------------------------|-----------------------------|
  | `value_type_t`                | `iter_value_t`              |
  | `reference_t`                 | `iter_reference_t`          |
  | `difference_type_t`           | `iter_difference_t`         |
  | `size_type_t`                 | _deprecated_                |
  | `rvalue_reference_t`          | `iter_rvalue_reference_t`   |
  | `range_value_type_t`          | `range_value_t`             |
  | `range_difference_type_t`     | `range_difference_t`        |
  | `range_size_type_t`           | `range_size_t`              |

\section v0-5-0 Version 0.5.0

_Released:_ Apr 30, 2019.

* **NEW:** MSVC support, from @CaseyCarter :tada: (See the docs for the list of supported compilers.)
* **NEW:** `view::enumerate`, from @MikeGitb
* **NEW:** `view::addressof`, from @tower120
* **NEW:** `unstable_remove_if` algorithm and action, from @tower120
* **NEW:** `adjacent_remove_if` algorithm and action, from @cjdb
* **NEW:** `ostream_joiner`, from @sv1990
* `view::drop_while` and `view::take_while` get projection support, from @mrpi
* `view::filter` and `view::remove_if` get projection support, from @mrpi
* `view::unique` accepts optional comparison operator, from @tete17